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Solve (x + y)dy = (x y)dr. %3D A. r + y? = c B. r + 2xy + y = c C. r2

Solve (x + y)dy = (x y)dr. %3D A. r + y? = c B. r + 2xy + y = c C. r2 - 2ry- y? = c D. r2 - 2.ry + =

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